Enamel coating of a coated glass substrate
a technology of glass substrate and enamel coating, applied in the direction of coatings, etc., can solve the problems of loss of coating functionality, lack of adhesion, delamination, etc., and achieve the effect of reducing the adhesion and reducing the cost of the process
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example 1
on of Bi—B—Zn-Based Oxide Compositions and Pastes
[0134]Table 1 gives examples of glass frit compositions. The raw materials for the frits were mixed and melted in a ceramic crucible in an electrical kiln. The kiln was heated up with a ramp of 30° C. / min and held at a peak temperature of 850 to 950° C. for 15 to 20 minutes. After this time, the glass melt was found to be homogeneous and was then quenched in water. The glass frit was then dried at 120° C. in a drying cabinet. After drying, the glass frit was ground using a jet mill (an Alpine-Hosokawa pico jet mill 40AFG) to a particle size of D(50)=6 to 7 μm and D(90)=12 to 13 μm.
TABLE 1Frit compositions in mol % and their coefficient of thermal expansion (CTE) in 10−7 K−1molar %Example NoComponents123456789Bi2O350.64744.24741.840.144.742.744.1B2O318.321.925.527.924.923.926.625.426.2ZnO30.831.130.325.122.321.423.922.723.5SiO27.514.60.2Al2O34.89.2MgO6MnO1.7BaO0.7CeO20.3Na2O1.1CTE11011311111310110710799108molar %Example noComponents101...
example 2
n of Coated Glass Substrates
[0138]The resultant pastes were screen printed using a 77T screen onto 6 mm thick coated glass plates (300×150×6 mm) with a wet layer thickness of 25-30 μm. The coated glass plates A, B, C and D employed in these tests are each commercially available coated glasses (A=ClimaGuard; B=SilverStar; C=SilverStar (2 Ag layers); D=Sunguard SN). The layer structure of each of these coatings (layer order starting from the glass substrate) is as follows:
[0139]A: silicon nitride, zinc oxide, silver, nickel / chromium, tin oxide zinc oxide, silicon nitride.
[0140]B: silicon nitride, tin oxide, zinc oxide, silver, nickel / chromium, zinc oxide, silicon nitride.
[0141]C: order similar to B but two silver layers separated by three layers of zinc oxide, tin oxide, zinc oxide.
[0142]D: 2× the sequence of A.
[0143]The prints were first dried at 150° C. for 15 minutes. Firing was then carried out in a two-chamber roller kiln (NBP combustion systems model Fer 2C 15 4Z-SDO) with a set...
example 3
lts for Coated Glass Substrates
[0144]The resultant enamels were evaluated to determine the following properties:[0145]whether the enamel dissolves the coatings completely
[0146]A characteristic of firing enamels on coated glass is the strong temperature difference between printed (heat absorbing) and non-printed (heat reflective) areas in the firing process. As a result of this, the edges of the print have lower temperatures and the conventional enamels either cannot attack the coating at the edge of the print or can only attack it partially, and full dissolution of the coating is therefore not observed.[0147](ii) whether the enamel forms a smooth surface
[0148]Conventional enamels frequently cause surface defects such as rough surfaces or bubbles, or coloured reflections with a metallic sheen. The formation of bubbles indicates that the reaction between coating and enamel was not completed during the firing process. A rough surface indicates that after the reaction had occurred, the ...
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